Emerson 208V Manuel D’Utilisation

This section describes checks to be made before starting the UPS, how to start the UPS, manual 

battery test, manual bypass, shutting down the UPS and disconnecting the utility power from the 

UPS.

Before starting the UPS, perform these checks:
___ 1. Check that the input plugs and loads are connected properly and reliably.
___ 2. Check that all of the battery cables are connected properly.
___ 3. Check that the communication cables are connected properly.

1. Turn On the input circuit breaker—see Figures 3 and 5 for its location.
2. Turn On the UPS by pressing the On/Alarm Silence/Manual Battery Test button for three 

seconds.
After the button is pressed, the LEDs on the display will signal that the unit has initiated the 

startup process.

3. Once the inverter LED has been illuminated, turn On the connected loads.
4. Check the status indicators to determine whether the Liebert GXT3 is operating normally.
5. Check the load level indicators to verify that the connected load does not exceed the UPS’ rated 

capacity.

The UPS is now providing conditioned power to the load.

To initiate a manual battery test, press the On/Alarm Silence/Manual Battery Test button for at least 

half a second while operating from utility power with no alarm conditions present. 

• If only first two of the five LED segments illuminate, allow the UPS to recharge the batteries for 

24 hours.

• Retest the batteries after 24 hours of charging the batteries.
• After the batteries have been retested, if only two of the five Battery LEDs illuminate, contact 

your local Emerson representative or Emerson Channel Support.

• If none of the five Battery LEDs illuminate during a manual battery test, check the battery con-

nection and allow the UPS to recharge the batteries for 1 hour and initiate a manual battery test 

again.

• If none of the five Battery LEDs illuminate during the manual battery test a second time, replace 

the batteries, and contact your local Emerson representative or Emerson Channel Support.

Press the Standby/Manual Bypass button once while the UPS is in utility (AC) mode and hold it for 

about 2 seconds. The UPS will transfer the connected loads to the internal bypass. If the internal 

bypass is not available due to utility power problems, pressing this button once will be ignored. 

Bypass operation is indicated by an audible alarm and illuminated amber Bypass indicator. If other 

indicators are illuminated, refer to 7.0 - Troubleshooting.

NOTE
The Liebert

®

 GXT3

™